<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <ul>
        <li>
            <a href="http://www.baidu.com" target="mainFrame">百度</a>
        </li>

        <li>
            <a href="http://www.taobao.com" target="mainFrame">淘宝</a>
        </li>
    </ul>
</body>
</html>